Questions tagged [high-current]

Say how much current is required, high-current means different things to different people.

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Would this situation I have work or would something blow? [closed]

I am constructing a robot that uses this chassis: https://shop.pimoroni.com/products/dagu-wild-thumper-6wd-all-terrain-chassis?variant=39352843010131 It states that effectively It takes 7.2V and 6A ...
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Recommended modelling software for 200 μs pulse width pulse transformer application

I am looking to model a HV pulse generator that involves discharging a 6 μF capacitor at about 300 V across the primary coil of a transformer. This discharge happens about once every 1.5 seconds. The ...
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1 vote
2 answers
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Why doesn't my difference amplifier get saturated in LTSpice?

I'm currently simulating my high- side current sense amplifier for measuring mains current(along with the LP filter) .I also have the voltage sensing in the corner and I have attempted to simulate a ...
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1 answer
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Voltage regulator consume more current

I have used LP3961 3.3V regulator cicuit for my STM32 microcontroller circuit. I have implemented low power stop mode in STM32. Micro controller consumed 25uA itself. When I Measured the current ...
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3 votes
2 answers
108 views

How to design an adjustable 5A current regulator with LM338?

I have recently taken interest in laser diodes, and I would like to drive one of them (NUBM08) without destroying it. Looking over the internet I learned there are many devices one can build to do ...
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2 answers
58 views

240V Mains - Current draw and when to use Solder vs Welding

No specific application, just for interest - I opened up a multiplug/multiboard and noticed that all the contacts for welded (i.e. no solder). I was just wondering if this had anything to do with ...
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2 votes
1 answer
72 views

Measuring the diode current

R1=15kΩ R2=40kΩ R3=40kΩ E=4V VI--> -8V<VI<8V. In this circuit, diodes D1 and D2 are the same model 1N4007 diodes. (Is=7.02767E-09, VJ=0.7) When I assume that D1 is on and D2 diode is off, ...
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1 vote
1 answer
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IGBT operation failure at high current

I tried to use IGBT (skm400ga-12t4) to do fast current switching of circuits with an inductor. The gate driver used adum4121-ARIZ and gate driving was performed by making a same circuit to the example ...
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1 answer
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Best way to provide 5V at a high current to power 12+ servos using battery power

I am currently in the process of building a quadruped robot that uses 12 SG90 servos, controlled by a PCA9685, for motion. I've found many examples of quadrupeds, but barely any mention of their power ...
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-2 votes
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Do I need EMI shielding for a 5V signal PCB placed beside high powered DC cable 48V 50A?

I have PCBs located just below the high-powered DC cable at 50A 48V. My PCB has input-output from 5V signal cables from all over the place. The 5V signals are for: 12V and 5V Signal driving the EM ...
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1 vote
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Could I use a plow solenoid to interrupt my TIG welder with a foot pedal?

I have a multi-process welder that can do TIG, but only with a lift start and a manually opened and closed gas valve on the torch, with no option for a foot pedal. I am planning on adding a foot pedal ...
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INA128 - what is wrong with this circuit?

I built a circuit based on the INA128 which for some reason heats up rapidly. The test setup is like the image below. The output is left unconnected, no input signal. I get around 550mV voltage drop ...
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2 answers
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Regulator controller current capability

I am tasked with the design of a board that needs a buck regulator. This regulator will work on low voltages (Vin ~= 12V, Vout ~= 4V), but high output current is required (> 60A). I decided to use ...
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About the suitability of a Molex connector vs AS150 for high current applications

I am currently working on a system that requires: Board to board connector for high current applications. This operates at approximately 44v. Expected currents: 200A, with burst up to 300A Expected ...
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High current (~100A) linear regulation

Hello I need to drive resistive load of 0.25 OHM. I have 24V 100A power source available. I use computer to measure operating conditions, but as response I need to control current and by this ...
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1 vote
1 answer
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Transfer Function of Controlled Capacitor Discharge

I've been having some difficulties trying to design a closed loop, current pulse control system that controls a capacitor's discharge to an inductive load. The basic operating principle is that there ...
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2 votes
2 answers
134 views

High voltage power thermal fuse for DC

I am looking for ways to break a high voltage DC power line when an overheating scenario occurs. Preferably I would like to do so using a thermal fuse but can’t find any thermal fuses rated for high ...
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How to solder high amperage PCB wire lugs

My concerns are how to successfully hand solder a double-sided, 4oz copper PCB. The plated-through holes in the board have no thermal reliefs and are attached to the power and ground planes. The board ...
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Powering brushless motor only works with separated power supplies

I have recently taken over for a guy who retired from my company and I am working on getting a prototype that he designed back in 2016 up and running. We are using two 3.6 V 18650 batteries to power ...
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-1 votes
1 answer
117 views

Why is my MOSFET ON when there is no gate voltage and OFF when there is a gate voltage? [closed]

I have been working on a coil gun but am having trouble with the firing mechanism. My coil gun capacitor bank supplies 400v and instantaneous current of 666 amps based on the resistance of the coil. ...
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-1 votes
1 answer
39 views

DPST Switch and LEDs on High Power DC Lines

My goal is to wire up this LED indicator light so that when the DPST toggle switch is closed (ON), the LED will turn on. I have 30V LEDs that I can use that will use 20mA. However, this LED will be ...
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1 answer
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High-Side P-Channel MOSFET for Lower Rated Toggle Switches

My goal is to add two toggle switches to high power DC lines so that I can break the circuit and stop power from being delivered to my load. This load will be using 28V, ~27A. I have an two channel ...
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2 votes
4 answers
161 views

Methods for high current DC motor emergency cutoff

I need to add a secondary means of cutting off power to a motor for safety reasons if a state change is detected on a 3.3V logic level signal while it is operating. The requirement I have is that it ...
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3 answers
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Pulsed Current Source Across Inductive Load

Just wondering if you guys have any recommendations for low voltage, high current pulsed power supply designs. The current required is 300A for a 0.14mH inductive load with 0.088Ω of resistance. The ...
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1 vote
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62 views

Switching large batteries between 12 V and 48 V connections

I have four 200 Ah batteries that I am using to drive two separate really high current loads. The first load is 12 V at around 400 A and the second is 48 V at around 120 A. I was wondering if I could ...
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2 votes
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91 views

ESC (flyback diode)

i bulid ESC circuit based on TLP250 gate driver and IRF3205 MOSFET ,My motor works with 5V and consume about between 6 A and 8 A. the ESC circuit works well over month with software PWM frequency = ...
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1 vote
1 answer
122 views

How are high currents generally handled on PCB?

I am working on a 4-layer PCB where an electric current of 40 A - 12 VDC needs to pass through 2 traces (for 2-3 cm) between two through-hole components, for 1 minute every hour. 200 units of the ...
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2 votes
2 answers
660 views

Supplying Raspberry PI 3 through power header pins

I am making a POV display. For that I am using an LED strip, a motor, and a Raspberry PI 3. All work with 5V. My motor consumes about 6 A, LEDs 4 A, and the Raspberry Pi 3 normally uses 2.5 A. Thus my ...
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  • 111
2 votes
1 answer
106 views

High-power motor driver without driver IC

I'm developing a circuit to power a 300W DC motor with 25A rated current. I have experience powering smaller motors with motor driver ICs, but I can't seem to find an in-stock motor driver IC designed ...
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1 answer
99 views

In the PCB design, how should the a2 terminal island of a triac in the 252 sheath be?

For the A2 terminal of the triac in pcb design, I want to use both the front and back surfaces of the pcb. How should the vias be between the back and front surface?(actually zone areas in surfaces)I ...
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2 votes
1 answer
65 views

Mitigating parasitic turn-on of MOSFET

UPDATE Thanks Aaron and jp314 for your comments. We just probed some more and I think jp314 is right. We found that the high side driver was skipping some pulses. The pink pulse train is from the ...
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2 answers
186 views

Generate 1000V 30A AC from a 12V lead acid battery for a short period, but in a cycle

I am trying to trigger a device which requires a current of 1000V 30A current for operation, but for a very short period. It just needs to be powered for a maximum of 50-100 milliseconds but 6-8 times ...
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0 votes
3 answers
229 views

Linear (LM317 based?) high current / voltage regulator ( 30 amps at 0 - ~35 volts)

I'm looking to make a linear (LM317 based?) high current / voltage regulator (30 amps at 0 - ~35 volts). I looked at some desings online but still have some problems with it. Maybe you can guide me ...
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0 votes
2 answers
74 views

Can relay source and switching source be the same?

I'm working on a schematic for a power supply system for several linear actuators. I would like to minimize the power supplies needed to run the system. Can the source used to switch a relay be the ...
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-1 votes
2 answers
212 views

Prevent 36V going through 12V, 30A circuit

I have to arrange 3 of 12V batteries using a DPDT switch. Position A: 3 batteries are connected in parallel to supply 12V to devices in my van. Position B: 3 batteries are connected in series to ...
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0 answers
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Heat concerns using 12/14 AWG wire for 30A 5V DC power over shorter distances?

I’m hoping for some advice on wire gauges in practice with respect to heat/safety. I am planning an LED strip setup and have created the following diagram: The setup is designed to be modular, A ...
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  • 101
1 vote
1 answer
98 views

Looking for a specific material for PCB coating

I am in the process of getting a PCB ready for mass production. The PCB has high-current traces (up to 32A) and in order to improve isolation and protect it from the environment I am looking to either ...
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1 vote
0 answers
148 views

Current Capacity of Rectangular hollow copper bar

I have visited various site which include the table for current capacity of insulated wire and the busbar but no a single website gave the any particular equation or any calculation to measure current ...
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29 views

Software for studying temperature under different current and load conditions

Is there a software for studying temperature under different current and load conditions? From my few minutes of searching online, it looks like there isn't. If so, what would be the best way to get ...
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-1 votes
1 answer
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Stability problem when using an OpAmp to drive a BJT for high current application

I am designing a circuit for my lab, and in that application I need to have several low noise current source driving coils at roughly 7V, 20A. I could not find a benchtop power supply cheap enough so ...
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3 votes
4 answers
1k views

PWM motor control, MOSFET getting very hot

I have problem driving a high current DC motor (RS-775 24V-12V 80W), the MOSFET getting very hot when I use PWM signal. I'm using Raspberry Pi 3 b+ to generate PWM signal at (pin 8) which connected to ...
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  • 111
2 votes
2 answers
211 views

Alternative methods of switching high currents other than a relay

What are the alternatives to switching high currents (or voltages) of electricity, besides a relay? A relay is all good and well, but it is rather bulky and requires almost 75% of the relays rated ...
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2 votes
2 answers
128 views

Copper Plane Oz and Max Amp Relationship

I am attempting to design a power distribution board for up to four ESC controllers that can draw a continuous current of 40 A per ESC (so 160 A), from one LiPo battery. Additionally this board will ...
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0 answers
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How do I protect a contactor in arc weld circuit from wear?

I have a load banker (a toaster run by a 100 - 800 amp 10 - 40 V DC welder with non contact amp and volt sensors built in). I am trying to make an arc flash prevention unit for it. Relay control with ...
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0 votes
1 answer
77 views

Are PMOS still ideal for Reverse voltage protection of 75 A

I am creating a power management circuit for a 20m RGBW led strip, these leds operate on 5v and would require a current consumption of about 60A. I will actually split it into 8 channels of 2or3 ...
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1 vote
2 answers
218 views

High Current PCB Design (polygon pour vs thick tracing)

I'm needing to design a PCB for power distribution. I have a 90W (5V 18A) power supply that will be responsible for powering 5 USB Type A outputs, each USB drawing up to 12.5W (5V 2.5A) MAX. I'm used ...
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3 votes
3 answers
555 views

High current headers/ jumpers

The old fashioned way to configure a lot of boards is to use pin headers with their jumper cap, i.e.: https://www.tme.eu/en/details/jumper-kpl/pin-headers/connfly/ds1027-01-2ab801/ On my board I need ...
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2 votes
2 answers
239 views

How to switch a 700A 200V pulse for a coilgun?

I'm working on a coilgun and I need to discharge a capacitor bank through a coil to create a strong magnetic field. My coil has a resistance of 266 milliohms and when fully charged, the capacitors are ...
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  • 21
0 votes
1 answer
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is it safe/practical to control this 30A+ motor with mosfet?

I'm thinking of controlling a few high ampere water pumps from microchips. the current draws of motors will be around 38A (single phase 220V motors). is it safe to use a MOSFET (IPW60R070C6 from ...
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0 votes
0 answers
47 views

High current regulator

I have a DC motor (I=10A,V=12V.) I want to drive this motor with an H-bridge and want to have speed control with votage (2-12V.) I think I need a regulator with high current. How can I make a high ...
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